Answer:
The first 2 and the 2nd to last equations
Step-by-step explanation:
Angles 8 and 10 are alternate interiors, which would only work if m and n are parallel.
Angles 1 and 9 are congruent angles, which would only work if m and n are parallel.
Angle 1 and 3 are on the same line, so that can't prove it.
m8 and m9 could only add up to 180 if m and n are parallel, which makes this also true.
Angles 7 and 10 add up to 180, but can't be congruent.
